Use nullable type for Calculator::set()

brick · Jul 21, 2018 · 726a8f2 · 726a8f2
1 parent 096df6e
commit 726a8f2
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/Internal/Calculator.php b/src/Internal/Calculator.php
@@ -46,7 +46,7 @@ abstract class Calculator
      *
      * @return void
      */
-    public static function set(Calculator $calculator = null) : void
+    public static function set(?Calculator $calculator) : void
     {
         self::$instance = $calculator;
     }